am33xx: Fix USB for am335x boards

USB nodes were mistakenly disabled in

    commit 942853dd ("arm: dts: Resync BeagleBone device trees")

This commit is to fix the following issue:

    starting USB...
    No working controllers found
    USB is stopped. Please issue 'usb start' first.
    starting USB...
    No working controllers found

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0782e8572ce43f521ed6ff15e4a7ab9aa5acdc85


Fixes: 942853dd ("arm: dts: Resync BeagleBone device trees")
Signed-off-by: Matwey V. Kornilov <matwey.kornilov@gmail.com>
Reviewed-by: Paul Barker <paul.barker@sancloud.com>